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The proper sequence of events in bone repair is

A.

callus formation, hematoma formation, callus ossification, remodeling of bone

B.

remodeling of bone, callus ossification, hematoma formation, callus formation

C.

hematoma formation, callus formation, callus ossification, remodeling of bone

D.

callus ossification, callus formation, remodeling of bone, hematoma formation

E.

hematoma formation, callus ossification, callus formation, remodeling of bone

Answer and Explanation

The Correct Answer is C

A. callus formation, hematoma formation, callus ossification, remodeling of bone
Incorrect sequence. Hematoma forms first, followed by soft callus, then hard callus (ossification), then remodeling.

B. remodeling of bone, callus ossification, hematoma formation, callus formation
This sequence is completely out of order; remodeling is the final step, not the first.

C. hematoma formation, callus formation, callus ossification, remodeling of bone
 This is the proper order:

  1. Hematoma (blood clot) forms immediately after fracture
  2. Callus formation (fibrocartilaginous soft callus) bridges the break
  3. Callus ossification (hard callus) replaces cartilage with bone
  4. Remodeling reshapes the bone to restore structure and strength

D. callus ossification, callus formation, remodeling of bone, hematoma formation
Incorrect-chronologically reversed.

E. hematoma formation, callus ossification, callus formation, remodeling of bone
The ossification step comes after the initial callus formation, not before.


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Related Questions

Correct Answer is B

Explanation

A. circumferential lamellae
These are outer and inner rings that encircle the entire compact bone structure, not the rings within an osteon.

B. concentric lamellae
These are the circular layers of bone matrix surrounding the central (Haversian) canal within each osteon.

C. interstitial lamellae
These are incomplete lamellae found between osteons, representing old osteons that have been partially resorbed.

D. sequential lamellae
This is not a valid anatomical term used to describe lamellae in bone.

Correct Answer is C

Explanation

A. an inability to lay down new bone
Bone formation is the role of osteoblasts, not osteoclasts.

B. an inability to lay down cartilage
Cartilage is formed by chondroblasts, unrelated to osteoclasts.

C. an inability to regulate calcium
Osteoclasts resorb bone, releasing calcium into the bloodstream. Defective osteoclasts impair this process, disrupting calcium homeostasis.

D. an inability to create matrix
Osteoclasts break down bone matrix, they don’t create it. Matrix creation is done by osteoblasts.

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